Hi,
Black boxes:
In my opinion this design standard should undergo a great improvement.
From concept .. the black boxes did not change much.
Techniques to store data have improved (following developments with other techniques such as computer .. .. .. etc) .. but not their container .. or the system that allows to locate them.
In fact, these black boxes are considered a mandatory accessory by laws and therefore and so long they are present and in working condition ... everyone is happy and we can say that once everything is done to improve safety ....
When the accident occurs and the black boxes are not found .. or found after long searches (but what is the pinger?) and in addition they are deteriorated .. he is sure someone (authorities) to say that the black boxes were OK .. well maintained .. but the shock of the accident was very violent .. etc. ....
But everyone know that a plane that crashed into the ground or water .. suffer (mostly) a big shock ....